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Welding in the Food Industry
Jay Petter – Quality Tank Solutions
Larry Hanson - CIP Concepts, LLC
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Welding is Fundamental Process of Industry and the Economy
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Welding in Food industry
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Welding is a fabrication process used to join metals together using the heat of an electrical arc. The melting point of stainless steels is between 2417 and 2786 ⁰F (1325 to 1530 ⁰C) depend on the type of stainless.
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Welding Circuit
WeldingMachine
WorkpieceGround Cable
Power Cable
Arc
Electrode
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GTAW- Gas Tungsten Arc WeldingTIG Welding Machine
Controls• Voltage• Current (amperage)
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TIG Welding Torch (electrode holder)
Shield Gas (Pure Argon)
Tungsten Electrode
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Argon Gas for Shield Gas and Purge Gas
• Pressure Regulator• Dual Flowmeters
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Hygienic Tubing
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Manual and Orbital Tube Welding
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Argon Purge of Tubing
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TIG Tube Welding
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Documentation & InspectionNo Cracks, Crevices or Pits
• Standards• AWS D18.1 -
• AWS D18.2 – Guide to Weld Discoloration of Sanitary Tubing
• AWS D18.3 – Welding of Tanks, Vessels and other Equipment is Sanitary Applications
• PQR – Procedure Qualification Record
• WPS – Welding Procedure Specification
• WOP – Welder Operator Performance Record
• Weld Coupons
• Boroscope
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Good Orbital Weld
• Good Purge• Proper ID Weld
Oxidation Color• Full Penetration• Proper Convexity• Proper Concavity• Optimal Uniformity
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Good Manual Weld
• Good Purge• Proper ID Weld
Oxidation Color• Full Penetration• Proper Convexity• Proper Concavity
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High Hygienic Purged Tack
• Good Purge• Proper ID Weld
Oxidation (Color)
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Good Non-Purged Tack
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Tack not consumed
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No Backup Gas Purge
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ID Concave Weld
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ID Concave Weld
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Incomplete PenetrationOff-center
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Incomplete PenetrationInconsistent Width
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Incomplete PenetrationNarrow Weld Bead
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Pit in weldAbrupt Tail-off
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Sanitary Tank Welding
• Photo of tank
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Tank TIG Welding Video
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Tank Weld in Process
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\Dye Penetrant Inspection
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GMAW - Gas Metal Arc Welding Wirefeed (MIG) Welding Machine
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GMAW Wirefeed Torch
Shield Gas (Argon Mixture)
WireElectrode
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MIG Welding
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MIG Weld
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Laser Welding
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Summary
• Written PQR, WPS and WOR’s
• Certified Welders
• Inspection for Cleanability
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Questions